Doorbell



FIG. 1 is a front, first side, and bottom perspective view of a doorbell embodying the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a front, first side, and bottom perspective view of the doorbell with a battery access door in an open position;

FIG. 9 is a front, first side, and bottom perspective view of the doorbell with the battery access door in the open position and a battery partially removed; and,

FIG. 10 is a front, first side, and bottom perspective view of the doorbell with the battery access door in the open position and the battery fully removed.

Any uniform repeating broken lines being presented depict portions of a doorbell in which the claimed design is embodied and form no part of the claimed design. 

CLAIM The ornamental design for a doorbell, as shown and described. 